A woman has been killed after projectiles fired from Syria struck a school in the southern Turkish city of Kilis.

The office of the governor of Kilis said a rocket had hit a schoolyard and killed a cleaning lady, while two other rockets fell in vacant land.

A wounded student - a girl in the seventh grade - was taken to hospital for treatment, the governor's office added.

The mayor of Kilis, Hasan Kara, told Turkish NTV television that "mortars" had apparently been fired from Syria.

The broadcaster, quoting military sources, said the Turkish army responded with fire against targets in Syria.

Earlier, the state-run Anadolu Agency said four people were injured in an explosion on the grounds of a middle school in Kilis. There are four schools in the area, just 10 kilometres (six miles) from Syria.

The Syrian conflict has spilled over into Turkey many times, with artillery fire landing in Turkish border towns and the Turkish army responding in kind. Kilis lies near Syrian territory controlled by Islamic State.